1 Answer
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First to stay safe - If you do not have another administrator account to use, then create a new temporary administrator account, log off from your SERVERNAME\Administrator acc and log in with SERVERNAME\TEMPADMIN account

Rename "C:USERS\Administrator.SERVERNAME" user profile folder to something else, like: "C:USERS\Administrator.NEW" and after that rename your old admin user account folder name "C:USERS\Administrator" into the -> "C:USERS\Administrator.SERVERNAME"

Make sure that your SERVERNAME\Administrator (new admin) acc has full access rights to your old administrator user profile folder which is now named "C:USERS\Administrator.SERVERNAME"

Test your settings, and if everything is ok, you can ditch the newly created TEMPADMIN acc and do the cleanup. Test everything.